[Solved] What does the following EXPLAIN ANALYZE output line indicate?Seq Scan on customers (cost=0.00..100.00 rows=1000 width=50) (actual time=0.01..5.00 rows=1000 loops=1) | PostgreSQL

PostgreSQL - Set Operations and Advanced Queries

What does the following EXPLAIN ANALYZE output line indicate?

Seq Scan on customers  (cost=0.00..100.00 rows=1000 width=50) (actual time=0.01..5.00 rows=1000 loops=1)

AThe query used a sequential scan and processed 1000 rows in about 5 ms

BThe query used an index scan and processed 1000 rows in 0.01 ms

CThe query failed due to cost exceeding 100

DThe query did not run because loops=1 is invalid

Step-by-Step Solution

Solution:

Step 1: Interpret the plan node
Seq Scan means sequential scan on the customers table.
Step 2: Understand actual time and rows
Actual time shows start and end times (0.01 to 5.00 ms) and rows processed (1000).
Final Answer:
The query used a sequential scan and processed 1000 rows in about 5 ms -> Option A
Quick Check:
Seq Scan with actual time and rows = The query used a sequential scan and processed 1000 rows in about 5 ms [OK]

Quick Trick: Seq Scan means full table scan with actual timing [OK]

Common Mistakes:

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What does the following EXPLAIN ANALYZE output line indicate?